So I bought a Watson film loader off eBay, complete with film. Problem: previous owner bought it from original owner with film loaded, which was about six years ago, according to the seller. At any rate, he doesn't know what kind of film this is and neither do I. So I rolled a roll of 12 and I'm going to run out a shoot it. What should I guess for time to develop it until I can find out what kind it is?:er:

No edge markings usually means it's junk film, then. Afraid there is no way, short of doing a bunch of sensitometric tests, to find out speed and such.
My personal advice would be to bin it and not waste the chemicals.